Chrome extension data: free previews; API key for full reviews, comparisons and permissions.
Connect Remote server
claude mcp add --transport http mcp https://extensiondownloader.com/api/mcp --header "Authorization: Bearer <YOUR_API_KEY>"
{
"mcpServers": {
"mcp": {
"url": "https://extensiondownloader.com/api/mcp",
"headers": {
"Authorization": "Bearer <YOUR_API_KEY>"
}
}
}
}
{
"servers": {
"mcp": {
"type": "http",
"url": "https://extensiondownloader.com/api/mcp",
"headers": {
"Authorization": "Bearer <YOUR_API_KEY>"
}
}
}
}
Settings > Connectors > Add custom connector
URL: https://extensiondownloader.com/api/mcp
Replace the values in angle brackets with your own. Keys stay on your machine; we never see them.
Tools 16 found in our last check
extension_searchFind extensions by name, description or category name. Returns metadata and pagination, ordered by user count. Use returned IDs for detail and analysis tools; not Chrome Web Store keyword search positions.
extension_getGet collected store metadata for one extension, including users, ratings and version. Free without a key for basic metadata only; a key returns the full metadata record. Unknown IDs return not found, never trigger a crawl.
extension_trendsRead one extension's user-count, store rating-count and average-star history with current metrics and deltas. Use for time-series analysis, not keyword ranks. Missing days are not zero values.
extension_rank_historyTrack one extension's position in our overall and category user-count rankings. Returns per-scope history, not official store or keyword search positions. Untracked ranks may be missing.
extension_safetyInspect permission capabilities, observed permission changes and heuristic store risk signals. Reports evidence and incomplete assessments; not a malware scan, malware probability or safety guarantee.
extension_compareCompare up to four extensions side by side: users, stars, rating counts, versions, permissions and recent permission changes. For historical comparisons, call extension_trends for each ID; this is not code-similarity detection.
extension_topBrowse extensions ranked by current users, average stars or store rating count. Free without a key for the first 10 by users only; omit arguments for that preview. Other sorts and pagination require a key.
extension_trendingFind growing extensions using saved 7/14/30/90-day user or rating-count growth rankings. Candidates have 1K-1M users and at least 500 net new users in the window. Free without a key for the first 10 by 30-day user gain; omit arguments for that preview. Missing comparison data is…
extension_rankingsRead our saved user-count leaderboard for one date, overall or within a category. Returns positions and pagination; not official store or keyword search ranks. Use extension_rank_history to follow one extension over time.
extension_review_summaryGet an existing published AI summary of collected reviews, with pros and cons. Use extension_reviews for original comments. Returns null when unavailable and English when a translation is missing; never calls a model or generates a new summary.
extension_review_insightsRead stored review statistics and star distribution for an extension, optionally by review language. These describe collected reviews, not all store ratings. Missing statistics return null; no refresh is triggered.
extension_review_historyRead collected review counts grouped by original publication date and stars, plus version-level ratings and undated/unrated counts. Reconstructed from retained reviews, not historical store rating-count snapshots.
extension_reviewsRead original stored reviews for one extension, with text, star and language filters combined using AND. Returns reviews and pagination. For cross-extension or OR queries, use extension_reviews_search.
extension_reviews_searchSearch original stored reviews across extensions with AND/OR field filters. Returns reviews and pagination. Example filter: {"field":"body","operator":"contains","value":"subscription"}. Use extensionEid to narrow to an extension.
extension_source_searchFind extensions by Manifest metadata, permission names, host patterns, descriptions or archived source file paths. Returns metadata matches and snippets, not full-text JavaScript search, source downloads or code-similarity analysis.
extension_api_usageRead the current API key's daily REST/MCP usage and remaining key/account allowance. Requires a key, but remains available after its daily data quota is exhausted. Does not debit data quota; account minute limits still apply.
Headers
| Name | Description |
|---|---|
AuthorizationOptional, secret | Optional. Omit this header entirely for public discovery and rate-limited anonymous previews: basic extension metadata, top 10 by users, and top 10 by 30-day user growth. Other tools and broader queries require a valid API key with the corresponding scopes: enter Bearer followed by your key from ht… |
Details
| Endpoint | https://extensiondownloader.com/api/mcp (Streamable HTTP) |
| First published | 1 Nov 2026 |
| Last updated | 1 Nov 2026 |
| Registry name | com.extensiondownloader/mcp |
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